Engineered for absolute safety in volatile atmosphere environments (ATEX Zone 1, Zone 2, Zone 21, Zone 22).
An In-Depth Analytical Report on Regulatory Shifts, Decarbonization Mandates, and Technical Parameters for B2B Procurement Professionals.
Modern industrial sectors are encountering a dual imperative: securing operational environments against hazardous gas, vapor, and dust hazards, while simultaneously complying with stringent carbon emissions targets. Historically, explosion-proof motors (such as Ex d flameproof or Ex e increased safety models) lagged slightly behind standard industrial motors in their efficiency progression due to the physical limitations of safety enclosures, tighter air-gaps, and thermal regulation requirements. Today, however, the industry is witnessing a major evolution.
Under the IEC 60034-30-1 standard, energy-efficiency classes (IE3, IE4, and the emerging IE5) are now heavily integrated into hazardous area machinery. Leading OEM designers are incorporating Permanent Magnet Synchronous Motors (PMSMs) and advanced design variations to maintain low frame temperatures while maximizing output. By utilizing permanent magnet designs, like the WEPM series variable frequency PMSM motors, plants can minimize internal heat losses, which directly lowers the external surface temperature class (T-rating) of the machine—a vital metric for hazardous environments.
For engineering, procurement, and construction (EPC) firms, the choice of explosion-proof motors represents a critical risk-management decision. A single mechanical or electrical failure in an oil refinery, chemical processing facility, offshore platform, or deep-shaft coal mine can yield catastrophic safety events and massive capital losses. As a consequence, procurement criteria have evolved past baseline pricing. Sourcing departments prioritize suppliers that offer full certification traceability, international brand heritage, and localized design flexibility.
Crucial to this strategy is the concept of redundancy in safety. Engineers look for features such as high-strength cast-iron frames, dual-chamber terminal boxes for increased safety separation, vacuum pressure impregnated (VPI) class H insulation systems, and dynamic multi-physics simulation validation. By combining multi-physics structural optimization with rigorous test procedures (including thermal rise tests, breakdown torque verification, and flame-path tolerance inspections), suppliers ensure that their machinery operates well within safety margins even under volatile power grids and harsh localized microclimates.
As the authorized distributor of Wolong, Shaanxi Nanfang Motor Technology Co., Ltd provides an direct channel to the world's most advanced electric motor manufacturing resources. Founded in 1984, Wolong Electric Drive Group Co., Ltd was successfully listed on the Shanghai Stock Exchange in 2002 (code SH600580). Over three decades of technology refinement, global strategic acquisitions, and manufacturing excellence have positioned Wolong as an undisputed world leader in industrial drive technology.
Today, Wolong operates a vast global footprint consisting of 3 main manufacturing bases, 39 advanced factories, and 3 global R&D centers. By integrating century-old European electrical engineering heritage with modern high-capacity production facilities, the group is uniquely capable of supplying OEM solutions tailored to the world's most demanding heavy industries.
Wolong's global leadership is built upon the systematic acquisition and integration of the world's finest electric motor manufacturers. By absorbing these heritage brands, Wolong acquired unmatched technical expertise and intellectual property, consolidating these strengths into a unified, high-technology manufacturing portfolio:
In 2011, Wolong acquired a 97.94% stake in the Austrian ATB Group, one of Europe's top three motor manufacturers. This acquisition brought the historic brands Morley and Laurence Scott into the family. Morley, with a 130-year lineage, represents the peak of heavy duty machinery for underground coal mining. Laurence Scott is legendary for low-starting-current motors used in nuclear power stations and generators for British naval vessels, earning the Queen's Award for three consecutive years.
Brook Crompton Motors has defined motor technology for over a century, pioneering energy-efficient low, medium, and high-voltage AC motors like the "W" and "10" series for harsh environments. Joining Wolong in 2011, Schorch (established 1882 in Germany) is synonymous with customized high-power heavy duty drive systems for petrochemicals, oil, gas, power generation, and critical municipal water infrastructure systems.
Partnering with OLI since 1999, Wolong commands a top global share in industrial vibration motors. In 2015, China's largest explosion-proof research and production center, Nanyang Explosion Protection Group (CNE), officially joined Wolong. In 2018, General Electric's (GE) commercial and industrial motor division was integrated, strengthening Wolong's technological capabilities across heavy processing, petroleum, and marine platforms.
How Wolong Leverages Digital Twin Manufacturing, Vertically Integrated Material Pipelines, and Absolute Optimization.
In an era characterized by geopolitical fragmentation and supply chain uncertainty, Shaanxi Nanfang Motor Tech and the Wolong Group offer a stable foundation of industrial resilience. Our manufacturing centers operate under modern Industry 4.0 paradigms. From automated stator winding systems to automated, computerized rotor dynamic balancing, every step of the motor assembly process is monitored using MES (Manufacturing Execution Systems) and digital twins to ensure absolute structural consistency.
China's industrial ecosystem provides unparalleled access to raw materials—high-grade electrical silicon steels, pure copper wiring, high-yield structural cast iron, and state-of-the-art synthetic insulation resins. By localizing this entire supply chain within a highly integrated logistics network, Wolong eliminates the risk of component bottlenecks that plague smaller manufacturers. This vertical integration translates directly into predictable, reduced lead times, cost efficiency, and the capacity to handle massive OEM customizations without sacrificing project schedules.
Furthermore, our centralized logistics centers, coupled with Shaanxi Nanfang Motor's expert trade and distribution network, ensure seamless shipping, customs clearance, and global localized distribution. Whether your project is situated in the North Sea, the Middle East, or the mining corridors of Australia, we guarantee reliable machinery delivery backed by robust regulatory compliance.
Meeting ISO, NEMA, IECEx, ATEX, CSA, UL, SABS, and TESTSAFE Standards for Hazardous and Extreme Environments.
Nemko / ATEX
CSA
CE Standard
CC (China)
SABS (South Africa)
TESTSAFE
To operate in global markets, drive systems must be approved by regional safety authorities. Wolong has invested heavily in acquiring a complete portfolio of safety and performance certifications, eliminating regulatory barriers for international projects:
Exhaustive Technical Analysis of Stator Insulation, Rotor Dynamics, Heavy Duty Enclosures, and Acoustic Fan Technologies.
Our rotors feature a robust squirrel-cage design engineered for high starting torque and structural durability under heavy cycles. Cast aluminum rotors are produced using advanced centrifugal casting or high-pressure die-casting techniques. Under this process, molten pure aluminum is injected into the laminated electrical steel slots, creating a single-piece construction integrating the rotor bars and end-rings. For larger high-voltage motors, copper bar rotors are utilized, incorporating induction-brazed joint configurations and specialized retaining rings to withstand centripetal and thermal expansion forces during startup.
The heart of the electromagnetic circuit is the stator winding. We utilize high-grade polyester-imide overcoated polyamide-imide enameled copper wire, paired with high-mica content tape reinforced with glass cloth. Following winding insertion, the complete stator core undergoes the VPI (Vacuum Pressure Impregnation) process using solventless epoxy or silicone-based varnishes. VPI evacuates microscopic air pockets within the windings and fills them with solid resin, providing excellent electrical insulation, moisture resistance, heat dissipation, and mechanical rigidity against electromagnetic forces.
The motor enclosure is designed using digital structural and fluid multi-physics simulation platforms. Cast from high-grade grey cast iron (or fabricated steel for specialized models), our frames are engineered with thick walls, cooling fins, and robust terminal boxes to withstand internal explosion pressures without deformation. This frame design prevents flames or hot gases from escaping into the surrounding explosive atmosphere. Additionally, it offers excellent vibration damping and thermal heat transfer, keeping bearings and windings cool.
Explosion-proof motors can generate high acoustic signatures due to the cooling air volume required. Our low-noise system comprises a highly optimized fan cover body, an integrated air-guide cylinder, protective mesh windows, and strategic sound-absorbing silencer plates. The side-entry air inlet reduces turbulence and obstruction, cutting energy loss and lowering overall noise. The hood assembly is rated to IP22/IP55 requirements, preventing dust ingress and contact with the rotating fan blades.
Maximizing Safety and Operational Continuity Across Critical Production Processes Worldwide.
In refining plants, explosive mixtures of hydrocarbons and hydrogen gases are common. Wolong's Ex d flameproof and Ex e increased safety motors are used to drive high-pressure centrifugal pumps, gas compressors, and cooling tower fans, ensuring zero spark ignition hazards in Zone 1 and Zone 2 environments.
Deep-shaft extraction exposes equipment to highly volatile firedamp (methane gas) and combustible coal dust. Our heavy-duty Morley-engineered traction and conveyor motors provide the flameproof containment, high starting torque, and mechanical shock resistance required for shearers and armored face conveyors.
Offshore oil platforms, FPSOs, and chemical tankers operating in saline atmospheres require highly specialized equipment. With DNV type-approval certificates, our marine-duty low and high-voltage motors feature offshore marine coatings, anti-condensation heaters, and IP56/IP66 enclosure ratings to prevent water and salt ingress.
Technical Clarifications on Certifications, Installation, Frame Cooling, and Variable Frequency Drive Operation.
An Ex d (Flameproof) motor is designed to withstand an internal explosion of a specified gas mixture without damage, and to prevent the escape of flames or hot gases through joints (flame paths) to the surrounding atmosphere. In contrast, an Ex e (Increased Safety) motor focuses on preventing any sparks, arcs, or excessive temperatures from occurring on internal or external components under normal operation and specified overload conditions. Ex e motors are not designed to contain an internal explosion, but rather to prevent one from ever occurring.
Yes, but they must be specifically certified for VFD operation. VFDs introduce high-frequency voltage harmonics, which can lead to increased winding temperatures and shaft voltage discharges that risk bearing damage. Our motors, such as the WEBP3 series low-voltage variable frequency motors and the YBBPX high-voltage series, are built with insulated non-drive end bearings and reinforced VPI insulation systems. They are thermal-sensor protected to prevent surface temperatures from exceeding safety levels during low-speed, high-torque operation.
For marine and offshore environments, our motors (like the DNV-approved YQ Series low-voltage marine motors) are built with marine-grade cast iron frames and end shields. We use C4 or C5-M standard epoxy paint systems, stainless steel hardware, and specialized shaft seals (such as Inpro/Seal or labyrinth rings) to achieve IP56 or IP66 protection ratings. Internal windings are treated with moisture-proof tropicalization coatings, and anti-condensation heaters are installed to prevent condensation during standby periods.
IEC motors are designed to meet the international IEC 60079 series standards and are categorized by Zones (Zone 0, 1, 2 for gases; Zone 20, 21, 22 for dusts). NEMA motors conform to ANSI/UL 674 and CSA C22.2 No. 145 standards, utilizing a Class and Division system (Class I/II, Division 1/2). While IEC designs focus on millimeter-dimensioned metric shaft heights and flame-path configurations, NEMA motors specify fractional-inch shaft dimensions, service factors, and distinct conduit box arrangements. Our NEXP series bridge this divide by offering IEC performance in NEMA standard dimensions.
The T-code (Temperature Class, from T1 to T6) defines the maximum surface temperature that the motor can reach under any operating condition, including starting and overload. For instance, a T4-rated motor will not exceed 135°C on its external surface. This rating must be lower than the auto-ignition temperature of the gases or dusts present in the operating environment. If a motor is operating in an atmosphere containing hydrogen (ignition temperature approx. 560°C), a T1 or T2 rating is sufficient. However, in environments with ether vapors (ignition temperature 160°C), a T4 or T5 rating is required.
High-voltage motors (typically 3kV to 11kV, such as the YKK and YAKK series) generate high electrical stresses within their slot sections. If air pockets remain within the insulation tape layers, partial discharge (corona) can occur, leading to degradation of the insulation material and eventual electrical failure. The VPI process removes all air from the stator core and replaces it with epoxy resin. Once cured, this resin bonds the coils into a solid mass with high dielectric strength, thermal conductivity, and mechanical resistance to start-up forces.
As Wolong's authorized distributor, we coordinate closely with global R&D departments to align motor designs with client engineering specifications. We manage the entire order process, including design approval, production scheduling, factory acceptance testing (FAT), and delivery logistics. By leveraging Wolong's global manufacturing footprint and our specialized international trade team, we ensure compliance with local import regulations and provide on-time shipping to port or job site.
Ex-proof and high-efficiency asynchronous and synchronous motors for pumps, fans, compressors, and material handling systems.
Connect with Shaanxi Nanfang Motor's engineering department. We provide comprehensive OEM/ODM design support, customized mounting options, special voltage configurations, and full certification packages for hazardous environments worldwide.
Contact Our Technical Sales Team
NANFANG
